Build Of KeycloakApplication · Redhat
CVE-2026-9794
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceKeycloak's SAML ECP endpoint returns distinct faultstrings in SOAP responses that reveal the client's protocol type when receiving specially crafted requests with varying client IDs. This allows unauthenticated remote attackers to perform protocol fingerprinting through information disclosure.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Build Of KeycloakApplication
all versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Keycloak is runningCheck running processes or service status for Keycloak (e.g., systemctl status keycloak, ps aux | grep keycloak, or check if port 8080/8443 is listening with Keycloak)Affected if Keycloak instance is running and accessible on the network
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Determine if SAML ECP endpoint is exposedCheck Keycloak configuration for SAML ECP endpoint settings, typically at /saml-endpoint/ecp path, and verify the server is listening on standard portsAffected if SAML ECP endpoint is accessible without authentication
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Test endpoint for information disclosureSend a crafted SOAP request to the SAML ECP endpoint with one client ID, then repeat with a different client ID. Compare the faultstring values in the SOAP fault responses.Affected if The SOAP fault responses contain different faultstrings or protocol indicators depending on the client ID used in the request
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Inspect SOAP response headers and bodyCapture and examine the full SOAP response from the ECP endpoint, looking for variations in error messages, fault codes, or protocol type indicators between requests with different client identifiers.Affected if Distinct faultstrings or protocol type information is revealed in error responses that varies based on input
If the SAML ECP endpoint is accessible and returns different faultstrings or protocol indicators in SOAP error responses depending on the client ID submitted, the environment is affected by this information disclosure vulnerability.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataNormalize error messages in the SAML ECP endpoint responses to prevent protocol type disclosure, and update Keycloak to the latest patched version when available.
Fix this in Build Of Keycloak
Scoped from the published advisory
- Consultation4.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9794 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-9794 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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